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  • Users: PeterIgg
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  1. PeterIgg

    Flange Finish for Spiral Wound Gasket

    Hi I am looking for assistance in justifying why a flange with a gasket sealing surface finish with approx 80 grooves/inch, roughly 63 micro inch should be acceptable for a spiral wound gasket in a process gas line (LNG plant). I do not know why the valve has this finish, it should be as per...
  2. PeterIgg

    Fire Test Certificate for a replacement gasket

    Hi, I have a client who is requesting a 'Fire Safe Certificate' (API 6FA) for a gasket supplied as a spare part. I have explained that as a gasket cannot be tested in isolation, only as part of an assembly, that I am unable to supply such a certificate. However my customer is adamant and states...
  3. PeterIgg

    Post Weld Heat Treatment - excessive soak time

    We have performed weld repairs on a valve body cast in ASTM A216 WCB. The client is accepting the weld repair but is querying the length of time that PWHT was held at temperature. The casting has a max wall thickness of 60 - 70 mm but the casting was held at 620°C for 6 hours. The client...
  4. PeterIgg

    Removal of Natural Gas odoriser from the gas

    Hi all, The client is using odorised natural gas at 550 - 700 kPa to power a pneumatic style, spring return, piston actuator. However the requirement is to use an activated carbon filter on the vent to, presumably, make the air around the valve tolerable and allow any real leaks to be nasally...
  5. PeterIgg

    Equivalent grade of steel to AS 2074 L6B-1

    Hi Is anyone aware of a similar ASTM / ISO specification for steel to Australian Standard AS 2074 Grade L6B-1? Is there even an old British standard equivalent to AS 2074? Application is a drive lever that is likely to be flogged using sledge hammers, therefore the impact strength is...
  6. PeterIgg

    Handling of Polyethylene Slurry

    Hi I am looking for any information about polyethylene slurry. We are looking to supply valves into this service and I would like to know about its physical properties and any experiences that anyone else has had in handling this product. My brief web search has shown that it can become...
  7. PeterIgg

    PCTFE - Amorphous / Crystalline

    Is anyone aware of a test that can be performed to give a reliable indication as to whether the form of the material is in either the crystalline or amorphous state? We use this material for seals in cryogenic applications and experienced a failure when using the crystalline form of the...
  8. PeterIgg

    Viton in Methanol

    I appreciate that viton is NOT a suitable sealing elastomer in methanol service but what are the implications of using viton in produced water with, say, 11,000 ppm methanol? Is the effect the same - viz deterioration of the viton. IS there a concentration limit that viton will take and is there...
  9. PeterIgg

    Low Conductivity Water (LCW) Seals

    Hi Anyone had experience in working with this fluid that they would care to share, specifically seal materials? I am aware of viton and EPDM being acceptable and Graphite and Ptfe definitely NOT. Any others? UHMWPE perhaps? Acetal (Delrin)? Any pitfalls that we should be aware of? Cheers.
  10. PeterIgg

    When is a certificate 3.1b?

    This follows on from a couple of earlier threads: Is there an actual difference between ISO 10474 and EN 10204 or are they identical. I have 10204 and seen the table from ISO 10474 describing the attributes of the various certificates and the wording is identical. Is the rest of the standard...
  11. PeterIgg

    References for HVOF applied carbides in corrosive environments

    I am looking for any data or references concerning the use of HVOF applied Tungsten Carbide (or similar carbides) for use in high temperature applications (to +500°C). The specific line media is magnesium chloride (assume dry), the application is a metal seated ball valve, the coating to be...

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